INVESTIGATION OF OSCILLATION TRANSMISSION MECHANISMS IN GRID-FORMING VIRTUAL SYNCHRONOUS GENERATOR SYSTEMS

Xiong Xinhua; Li Chang; Yang Yaqian; Yuan Jun; Zhao Chanjuan

doi:10.19912/j.0254-0096.tynxb.2025-0647

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (8) : 558-565. DOI: 10.19912/j.0254-0096.tynxb.2025-0647

INVESTIGATION OF OSCILLATION TRANSMISSION MECHANISMS IN GRID-FORMING VIRTUAL SYNCHRONOUS GENERATOR SYSTEMS

Xiong Xinhua¹, Li Chang¹, Yang Yaqian², Yuan Jun¹, Zhao Chanjuan³

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Abstract

To address the insufficient inertia and damping of power systems under high-penetration renewable energy integration, the grid-forming virtual synchronous generator （GFM-VSG） system emulates the operating mechanisms and dynamic characteristics of traditional synchronous generators to provide inertia and damping support to the grid. To address this issue, this paper aims to develop a model and assessment method for oscillation transfer effects, revealing the underlying mechanisms of oscillation transmission and analyzing the root causes of SSO-related instability in depth. The study finds that sub-synchronous oscillations in GFM-VSG systems are not solely caused by insufficient stability margins but may also result from oscillation transfer effects between different electrical quantities. Based on the proposed oscillation transfer effect assessment framework and analytical method, the oscillation transfer effects in GFM-VSG systems can be quantitatively evaluated. Finally, experiments verify the effectiveness and feasibility of the proposed modeling method and assessment framework.

Key words

grid-forming virtual synchronous generator （GFM-VSG） / sub-synchronous oscillation / oscillation transmission / modeling method / small-signal modeling / renewable energy grid integration

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Xiong Xinhua, Li Chang, Yang Yaqian, Yuan Jun, Zhao Chanjuan. INVESTIGATION OF OSCILLATION TRANSMISSION MECHANISMS IN GRID-FORMING VIRTUAL SYNCHRONOUS GENERATOR SYSTEMS[J]. Acta Energiae Solaris Sinica. 2026, 47(8): 558-565 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0647

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